Textastic for Mac supports the same languages as Textastic for iPad. See http://www.textasticapp.com/v4/manual/lessons/Which_file_types_are_supported.html

Pascal is supported, which should work rather well for Delphi, too.

Textastic doesn't support TextMate snippets, but uses its own syntax for code completion and template files: https://github.com/blach/Textastic-Customization

Looks like I missed that behavior. I'll add it in an update. Thanks!

Thanks for letting me know. I'll fix that in the next update.

Well, it's one of the features I miss the most myself, but it's also one with many votes ;) - it's a top priority for me.